std::hash<std::error_code> (3) - Linux Manuals
std::hash<std::error_code>: std::hash<std::error_code>
Command to display std::hash<std::error_code> manual in Linux: $ man 3 std::hash<std::error_code>
NAME
std::hash<std::error_code> - std::hash<std::error_code>
Synopsis
Defined in header <system_error>
template<> struct hash<error_code>; (since C++11)
The template specialization of std::hash for std::error_code allows users to obtain hashes of objects of type std::error_code.
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